59 results about "Lanthanum hexaboride" patented technology

The invention discloses a preparation method of a nano lanthanum hexaboride reinforced titanium-based composite material, which comprises the following steps: performing low-energy ball milling and high-energy ball milling on a pure titanium metal powder and / or titanium alloy powder base material and a nano lanthanum hexaboride powder reinforced phase to obtain composite powder; sintering in a rapid hot-pressing sintering furnace, and cooling to obtain a LaB6 / Ti-based sintered blank; and carrying out heat-preservation hot rolling in a vacuum heat treatment furnace. The invention further discloses the nanometer lanthanum hexaboride reinforced titanium-based composite material and application. The nanometer lanthanum hexaboride reinforced titanium-based composite material has excellent strength and ductility, the tensile strength reaches 1035 MPa, the percentage elongation after fracture is 5%-25%, and the strength is improved by 60% or above compared with that of pure titanium; the preparation method is short in process, high in efficiency, low in production cost, high in universality and suitable for various titanium or titanium alloy base materials, and the composite material has good application prospects in the fields of radar, aviation, aerospace, automobiles, electronic industry and biomedicine.

The invention relates to the technical field of composite materials, in particular to a heat and sound insulation PVB intermediate film and a preparation method thereof. The problem that a PVB intermediate film is insufficient in heat insulation and aging resistance is solved. The preparation method comprises the following steps: pre-plasticizing PVB resin, shearing and mixing the pre-plasticized PVB resin and silane coupling agent modified enhanced nano cellulose, sequentially adding additives such as a plasticizer, molybdenum trioxide loaded lanthanum hexaboride, a composite light stabilizer and modified cerium oxide, and carrying out tape casting and hot pressing treatment to obtain the PVB intermediate film. Wherein the modified lanthanum hexaboride enhances infrared ray shielding, the composite light stabilizer and the modified cerium oxide synergistically improve the aging resistance, all the components are subjected to substance cooperation and process cooperation, comprehensive improvement of heat insulation, sound insulation and aging resistance of the PVB intermediate film is achieved, and the PVB intermediate film is suitable for the field of high-strength building glass.

The invention discloses a high-transparency PVB intermediate film and a production process and application thereof, and relates to the technical field of PVB intermediate films, the high-transparency PVB intermediate film comprises the following raw materials by weight: 100 parts of PVB resin, 20-30 parts of a composite plasticizer, 0.5-0.9 part of an LDH-based composite antioxidant, 0.5-1 part of an ultraviolet light absorber, 0.1-1.5 parts of nano lanthanum hexaboride, 0.1-1.5 parts of porous hollow nano copper sulphide, and 0.1-2 parts of nano TiO2 / SiO2 core-shell particles. The PVB intermediate film provided by the invention is relatively high in light transmittance, low in haze value, and excellent in oxidation resistance, weather resistance and mechanical strength.

The invention relates to the technical field of metal material surface strengthening and modification, in particular to a preparation method and process of a titanium alloy laser cladding cobalt-based wear-resistant coating. The invention provides a titanium alloy surface laser cladding cobalt-based wear-resistant coating which takes titanium or a titanium alloy as a base material, comprises the following components in percentage by weight: 40-50% of cobalt (Co), 30-40% of tungsten carbide (WC), 10-15% of chromium (Cr), 1-5% of lanthanum hexaboride (LaB6), 2-5% of silicon (Si) and 0.5-3% of calcium fluoride (CaF2), and has the beneficial effects of improving wear resistance, high-temperature stability, corrosion resistance, high hardness, high bonding strength, difficulty in cracking and the like.

The invention relates to the technical field of illumination, in particular to a near-net-shape lanthanum hexaboride tungsten-doped cathode and a preparation method and application thereof. The invention provides a preparation method of a near-net-shaped lanthanum hexaboride tungsten-doped cathode, which comprises the following steps of: mixing tungsten powder and lanthanum hexaboride powder to obtain a mixture, placing the mixture in a mold of which the inner wall is coated with a carbon powder layer, carrying out first hot pressing sintering at a first temperature, heating to a second temperature, carrying out second hot pressing sintering, and cooling to obtain the near-net-shaped lanthanum hexaboride tungsten-doped cathode. And the near-net-shaped lanthanum hexaboride doped tungsten cathode is obtained. Wherein the first temperature ranges from 1500 DEG C to 2000 DEG C; the second temperature is 2200 to 2400 DEG C; in conclusion, one-time forming of the lanthanum hexaboride-doped tungsten cathode is achieved, the efficient and low-cost preparation method of the lanthanum hexaboride-doped tungsten-based cathode material is developed, meanwhile, a loose lamellar tungsten carbide layer is formed on the surface of the lanthanum hexaboride-doped tungsten cathode, and the electron emission performance of the material is effectively improved.

The invention discloses a composite heat stabilizer and PVB resin and application thereof, and belongs to the technical field of polyvinyl butyral materials, the composite heat stabilizer is prepared from the following raw materials in parts by weight: 1-5 parts of lanthanum hexaboride, 0.5-2 parts of cerium oxide, 0.3-0.8 part of tantalum selenide and 10-20 parts of silicon dioxide. The PVB resin is prepared from the composite heat stabilizer, and the application refers to the application of the composite heat stabilizer in preparation of the PVB resin. The composite heat stabilizer provided by the invention can significantly improve the heat stability of PVB, and also has a certain improvement effect on the comprehensive performance of PVB.

The invention discloses polycrystalline lanthanum hexaboride and a preparation method and application thereof, and belongs to the technical field of lanthanum hexaboride preparation.The preparation method comprises the following steps that mixed powder of lanthanum hexaboride powder and spherical nickel powder is subjected to ball milling in shielding gas, and ball-milled powder is prepared; the ball-milled powder is sieved through an ultrasonic vibration screening instrument, and mixed powder with the particle size being 1-2 microns is collected; and putting the sieved mixed powder into a mold, then carrying out gradient hot pressing sintering under a vacuum condition, and after sintering is finished, cooling to obtain the composite material. The relative density of the material is as high as 99.42%, the material has the advantages of high density and strong hot electron emission performance, and the method is low in production cost and low in process difficulty, and can effectively solve the problems existing in preparation of polycrystalline lanthanum hexaboride by an existing sintering method.

To provide an electron-generating material and electron-generating member, which can reduce a friction coefficient.SOLUTION: An electron-generating material capable of reducing a friction coefficient is provided, the material comprising powder of a natural mineral containing a radioactive substance and powder of an electron-generating material that generates electrons when subjected to alpha rays emitted from the natural mineral, where the powder of the electron-generating material comprises titanium dioxide powder, lanthanum hexaboride, and silicon metal.SELECTED DRAWING: None

This invention relates to the field of welding electrodes for duplex stainless steel, specifically to a welding electrode for duplex stainless steel and its preparation method. When residual stress at the weld seam of 2209 duplex stainless steel is eliminated through high-temperature heat treatment, the mechanical properties and corrosion resistance of the weld seam significantly decrease. To address the above technical problem, this invention provides a welding electrode for duplex stainless steel that effectively slows down the phase transformation rate during high-temperature heat treatment, avoids excessive austenite formation, and maintains the balance of the duplex structure. The electrode coating composition specifically includes lanthanum hexaboride and Ti-6Al-4V alloy, which have grain-refining effects and simultaneously inhibit the precipitation of harmful intermetallic phases. This effectively suppresses the precipitation of harmful phases such as the σ phase during weld heat treatment, ensures the solid solubility of chromium and molybdenum, and allows the weld seam to retain excellent comprehensive properties after high-temperature treatment.

The invention discloses a preparation method of a lanthanum hexaboride / graphene hybrid reinforced Ti2AlNb-based composite material for high-temperature application, and relates to a preparation method of a Ti2AlNb-based composite material. The problems that an existing Ti2AlNb composite material is low in Ti2AlNb heat resistance, poor in plasticity and the like under the high-temperature condition are solved. According to the non-continuous reinforced Ti2AlNb-based composite material and the preparation method thereof, the non-continuous reinforced Ti2AlNb-based composite material is prepared by introducing an in-situ authigenic boride reinforcement body, meanwhile, dispersion strengthening is achieved in the Ti2AlNb composite material through cooperation of high strength of graphene and in-situ authigenic boride (Ti, Nb) B, when the graphene and the (Ti, Nb) B are jointly reinforced, stress is dispersed by the graphene, dislocation movement is hindered by the (Ti, Nb) B, the strength is remarkably improved through the synergistic effect, and the non-continuous reinforced Ti2AlNb-based composite material is obtained. Therefore, by adding the graphene, the interface bonding quality is improved, the stress concentration is reduced, the plastic deformation capacity is improved, the ductility is remarkably improved, and the strength and plasticity of the Ti2AlNb composite material at the high temperature are improved.

The invention provides a lanthanum hexaboride emitter adapted to a hollow cathode erosion process, the lanthanum hexaboride emitter is made of lanthanum hexaboride, the emitter is integrally in an axially symmetrical star-shaped cylinder structure, the cross section of the emitter is in a regular star shape containing n uniformly distributed star angles and n star grooves, the side edges of the adjacent star angles form a star edge included angle theta, and the thickness of the emitter is e. The inner surface degradation is divided into two stages by the H point (namely the point where the straight line C-D section disappears), and by designing parameters of n and theta, the emitter can realize constant-surface, increased-surface or decreased-surface degradation before the emitter is degraded to the H point. The emitter is designed to be reduced in surface degradation, so that the emitter can adapt to the actual working condition that the downstream degradation rate is higher in the working process of the hollow cathode, and the area of the electron emission surface of the hollow cathode is basically kept consistent in the whole life cycle. In addition, compared with a traditional emitter, the star-shaped emitter is smaller in outer diameter under the same emission area and thickness, the design of a small-size and low-power-consumption hollow cathode is facilitated, and the star-shaped emitter is suitable for a long-service-life aerospace electric propulsion task.

The application discloses a rare earth heat-insulating automobile window film and relates to the technical field of films.The prepared rare earth heat-insulating automobile window film is composed of a hardening layer, a magnetron sputtering film layer, a base material layer, a mounting adhesive layer and a release film layer in sequence and is integrated; the hardening layer is obtained by coating modified polyurethane on the magnetron sputtering film layer and solidifying; the modified polyurethane is obtained by mixing polyurethane prepolymer, modified lanthanum hexaboride and phosphorus-containing silane crosslinking agent; and the prepared rare earth heat-insulating automobile window film has good heat insulation, weather resistance and flame retardance.

The invention provides a high-density lanthanum hexaboride polycrystalline material and a preparation method thereof, and the preparation method comprises the following steps: (1) carrying out primary die filling on lanthanum hexaboride powder, and then carrying out hot isostatic pressing treatment to obtain a lanthanum hexaboride green body; and (2) carrying out secondary die filling on the lanthanum hexaboride green body obtained in the step (1), and then sequentially carrying out hot pressed sintering and post-treatment to obtain the high-density lanthanum hexaboride polycrystalline material. The lanthanum hexaboride polycrystalline material obtained by adopting the preparation method provided by the invention has relatively high density, and the internal organization structure and the internal grain size are uniform; and the preparation process is simple in flow, low in cost and suitable for industrial production.

The invention relates to a nickel-based interface cone coating, a nickel-based interface cone and a preparation method, the coating is a multi-layer boride coating, the multi-layer boride coating comprises a nickel boride layer, an other metal boride layer and a lanthanum hexaboride layer, the nickel boride layer is the innermost layer, and the lanthanum hexaboride layer is the outermost layer. Multiple boride coatings are prepared on the surface of the nickel-based interface cone through the vacuum magnetron sputtering technology, the nickel boride coating is arranged on the innermost side, the nickel boride can form a coating which is tightly combined and high in strength with the nickel-based interface cone, the middle coating is other metal boride coatings, the hardness, the strength and the heat conduction performance are high, and the nickel-based interface cone has the good heat conduction performance. According to the present invention, the lanthanum hexaboride coating is used as the outer layer, and can provide the supporting effect on the boride multilayer film, the outermost layer is the lanthanum hexaboride coating, the lanthanum hexaboride has good chemical stability, the introduction of other impurity atoms during the detection process is reduced, and the preparation cost of the coating is reduced by 10-20% compared with the platinum group metal coating.

The invention aims to solve the problem that the copper SLM printing machinability is poor, so that the performance of the copper SLM is seriously influenced. The preparation method comprises the following steps that S1, material preparation is conducted, specifically, high-purity copper powder and high-purity lanthanum hexaboride powder are mixed, and evenly-mixed powder is obtained; s2, the mixed powder is subjected to additive manufacturing forming through the selective laser melting technology; and S3, linear cutting is conducted, specifically, linear cutting is conducted on the printed lanthanum hexaboride / copper composite material workpiece in a linear cutting mode, and the lanthanum hexaboride / copper composite material is obtained. The preparation complexity and cost of the lanthanum hexaboride / copper composite material are greatly reduced, the prepared lanthanum hexaboride / copper composite material is good in compounding effect, high in strength and toughness and high in conductivity, and new possibility is developed for wide industrial application.

Apparatus and methods are disclosed for a mechanically stable, long-life, cold field emitter assembly which is compatible with ultra-high vacuum and occasional high-temperature flashing. A metal adapter is welded between a hexaboride electrode and a metal filament. Some embodiments use a tungsten filament, a tantalum adapter, and a LaB6 microrod electrode with a nanorod emitter tip. Other material combinations are disclosed, as also usage in electron sources for electron microscopes. In variations, the adapter is deposited onto the filament and the electrode then welded to the adapter.

The application discloses polycrystalline lanthanum hexaboride and a preparation method and application thereof, and belongs to the technical field of lanthanum hexaboride preparation, and the preparation method comprises the following steps: ball milling mixed powders of lanthanum hexaboride powders and spherical nickel powders in a protective gas to prepare ball-milled powders; screening the ball-milled powders through an ultrasonic vibration sieve classifier, and collecting mixed powders with a particle size of 1-2 microns; placing the screened mixed powders in a mold, and then performing gradient hot-pressing sintering under vacuum conditions; and cooling after sintering to obtain the polycrystalline lanthanum hexaboride. The relative density of the material is as high as 99.42%, the material has the advantages of high density and strong thermal electron emission performance, the production cost of the method is low, the process difficulty is low, and the method can effectively solve the problems existing in the preparation of polycrystalline lanthanum hexaboride by using the existing sintering method.

The invention discloses an oxide-doped LaB6 polycrystalline material and a preparation method and application thereof.The preparation method comprises the steps that lanthanum hexaboride and metal oxide are mixed, ball-milled to be uniform and dried to obtain first powder, the metal oxide is an oxide of M, and M is Al, Zr and Ti; the first powder is placed in a mold, the first powder is located in the center of the mold and has the same apparent density, in the inert gas atmosphere, the pressure is increased from the pressure P1 to the pressure P2, heat preservation is carried out for 0.5-3 h at the pressure P2 and the temperature of 1400-2000 DEG C, hot pressing sintering is carried out, cooling is carried out, meanwhile, pressure preservation is carried out for 0-3 h at the pressure P2, the LaB6 polycrystalline material doped with the oxide is obtained, the P1 ranges from 5 MPa to 9 MPa, and the P2 ranges from 20 MPa to 60 MPa. By adding the oxide phase, the sintering temperature of the pure LaB6 ceramic is reduced from 1975 DEG C to 1800 DEG C or below, the conductivity of the LaB6 ceramic is not deteriorated after doping, and the bending strength is effectively improved.

The invention discloses a multiphase ceramic material connector for a fuel cell, the multiphase ceramic material connector is divided into an upper surface layer, a middle matrix layer and a lower surface layer in the height direction, and the upper surface layer and the lower surface layer are both formed by compounding lanthanum hexaboride and hexagonal boron nitride. And the middle matrix layer is formed by compounding titanium diboride and hexagonal boron nitride. According to the invention, the composite ceramic material connector has excellent conductivity, can realize full-temperature-range conductivity from room temperature to high temperature, and has better mechanical properties and machinability.

The application discloses a shielding piece made of a tungsten-based alloy material, a preparation method and application, the tungsten-based alloy comprises a tungsten base and lanthanum hexaboride dispersed in the tungsten base, and the content of boron in the tungsten-based alloy is 0.01wt%-0.5wt%. The tungsten-based alloy in the application introduces lanthanum hexaboride, which is beneficial to the refinement of tungsten grains in the tungsten-based alloy, enhances the toughness of the tungsten-based alloy, reduces the ductile-brittle transition temperature, and improves the absorption capacity of the tungsten-based alloy to neutron irradiation; meanwhile, the introduction of the lanthanum hexaboride does not reduce the heat conduction performance of the tungsten base, but helps to improve the heat conduction performance of the material, which is all beneficial to the improvement of the service life of the shielding piece.

The invention relates to the technical field of welding materials, in particular to a preparation method of a flux-cored wire, which comprises the following specific steps of: weighing a flux core according to a weight part ratio, putting the flux core into a mixer, and uniformly stirring; the flux core is mixed and wrapped in a steel belt, and diameter reducing, wiredrawing and take-up operation are carried out; the preparation method of the flux core comprises the steps that cobalt powder, yttrium oxide powder, lanthanum hexaboride powder and iron powder are weighed by weight and then put into a pelletizer to be evenly mixed and pelletized, and the inner shell is obtained; the preparation method comprises the following steps: weighing carbon powder, magnesium powder, manganese powder, silicon powder, aluminum-coated nickel powder and iron powder in parts by weight, putting into a stirrer, and uniformly mixing to obtain a mixed material; and the mixed material and the inner shell are put into a pelletizer to be pelletized, and the flux core is obtained. According to the welding wire preparation method, the manufacturing process route is simple and easy to operate, the production efficiency of the welding wire is high, the surface of the welding wire is clean, and therefore when the welding wire is used, wire feeding is smooth, and splashing is small during welding.

The invention discloses a tungsten-copper-based alloy material as well as a preparation method and application thereof, and relates to the technical field of alloy materials. Lanthanum hexaboride and / or yttrium hexaboride are / is introduced into the tungsten copper material to serve as an additive, and irradiation damage of the tungsten copper material is avoided by means of the shielding capacity of boron to neutron irradiation; and meanwhile, lanthanum hexaboride or yttrium hexaboride is stable in property and has a particle reinforcing effect, so that the mechanical property of the tungsten copper material is further improved.

The present application relates to the technical field of composite materials, in particular to a heat and sound insulation PVB interlayer and a preparation method thereof.The present application overcomes the problem of insufficient heat insulation and aging resistance of the PVB interlayer.The PVB interlayer is prepared by mixing the PVB resin pre-plasticized with the silane coupling agent modified reinforcing nanocellulose, and then adding the plasticizer, lanthanum hexaboride loaded with molybdenum trioxide, composite light stabilizer, modified cerium oxide and other additives in sequence, and through casting and hot pressing treatment.The modified lanthanum hexaboride enhances the infrared shielding, the composite light stabilizer and the modified cerium oxide synergistically improve the aging resistance, and the components are synergized through the process to comprehensively improve the heat insulation, sound insulation and aging resistance of the PVB interlayer, which is suitable for the field of high-strength building glass.

The application discloses a barium tungsten lanthanum hexaboride composite hollow cathode, which comprises a cathode tube, a gas inlet is arranged at a first end of the cathode tube, a cathode top is arranged at a second end of the cathode tube, and a cathode top through hole is arranged in the cathode top; a touch electrode is arranged outside the cathode tube, an end of the touch electrode is provided with a touch electrode top, a touch electrode through hole is arranged in the touch electrode top, and the touch electrode is coaxial with the cathode tube; an emitter comprises a first emitter and a second emitter, the first emitter and the second emitter are sequentially arranged on an inner wall of the second end of the cathode tube in a direction from the gas inlet to the cathode top; a heater is arranged around an outer wall of the cathode tube; wherein the first emitter is a barium tungsten emitter, the second emitter is a lanthanum hexaboride emitter, and the lanthanum hexaboride emitter is heated by heat generated by self-sustaining work of the barium tungsten emitter, so that the starting power consumption is greatly reduced.

The X-ray generating device with switchable focus of the present invention includes a high-voltage power supply and an X-ray tube. The X-ray tube is disposed at one end of the high-voltage power supply and includes a cathode assembly, an anode assembly, an electron beam focusing assembly, a housing assembly, and a vacuum assembly. The cathode assembly includes a replaceable cathode unit, which is a lanthanum hexaboride cathode or a zirconium oxide tungsten cathode. By setting the replaceable cathode unit to a lanthanum hexaboride cathode or a zirconium oxide tungsten cathode, free switching between microfocus mode and nanofocus mode is achieved, enabling high resolution and high power output on the same device, and simultaneously meeting the high-precision inspection requirements of chip packaging and the high-power inspection requirements of circuit boards, batteries, etc.

To provide a method of manufacturing an electron-generating material capable of reducing the friction coefficient, and a method of manufacturing an electron-generating member.SOLUTION: A method of manufacturing an electron-generating material capable of reducing the friction coefficient is provided, the method involving forming a fluidic electron-generating material by mixing and agitating powder of a natural mineral containing a radioactive substance, powder of an electron-generating substance that generates electrons when subjected to alpha rays emitted from the natural mineral, and a dry fluid binder. The powder of the electron-generating substance comprises titanium dioxide powder and at least one type of powder selected from powder of lanthanum hexaboride, silicon metal, and molybdenum disulfide.SELECTED DRAWING: None

The invention relates to the technical field of welding rods for duplex stainless steel welding, in particular to a welding rod for duplex stainless steel welding and a preparation method thereof. When the residual stress at the welding seam of the 2209 duplex stainless steel is eliminated through high-temperature heat treatment, the mechanical property and the corrosion resistance of the welding seam can be obviously reduced. In order to solve the technical problems, the invention provides the welding rod for welding the duplex stainless steel, the phase change rate during high-temperature heat treatment is effectively slowed down, excessive austenite is prevented from being generated, and the balance of a duplex structure is kept; lanthanum hexaboride, Ti-6Al-4V alloy and other components which have the grain refinement effect and meanwhile can inhibit precipitation of harmful phases among metals are specially added into components of the welding rod coating, precipitation of the harmful phases such as sigma and the like in the weld joint heat treatment process is effectively inhibited, the solid solubility of chromium and molybdenum is ensured, and a weld joint still has excellent comprehensive performance after high-temperature treatment.

The application provides a lanthanum hexaboride emitter adapted to the erosion process of a hollow cathode, which is made of lanthanum hexaboride and has an axial symmetric star-shaped column structure, and the cross section of the emitter is a regular star shape with n uniformly distributed star corners and n star grooves, the side edges of adjacent star corners form a star edge included angle θ, and the thickness of the emitter is e. A point H (i.e. a point where a straight line C-D segment disappears) divides the inner surface degradation into two stages, by designing the parameters n and θ, the emitter can realize constant surface, increasing surface or decreasing surface degradation before degrading to the point H. The design of the emitter as decreasing surface degradation can adapt to the actual working condition that the downstream degradation rate is faster in the working process of the hollow cathode, so that the electron emission surface area of the hollow cathode is basically maintained consistent in the whole life cycle. In addition, compared with the traditional emitter, the star-shaped emitter has a smaller outer diameter under the same emission area and thickness, which is beneficial to the design of the small size and low power consumption hollow cathode, and is suitable for long life space electric propulsion tasks.

The invention discloses a heat-insulating high-transmittance polyester film and application thereof. The heat-insulating high-transmittance polyester film comprises a polyester base layer and a barrier layer arranged on the surface of the polyester base layer. The invention also provides a preparation method, which comprises the following steps: firstly preparing a biaxially oriented polyester film as the polyester base layer, and then coating the polyester base layer subjected to corona treatment with a barrier liquid composed of a cycloolefin copolymer and lanthanum hexaboride nanoparticles by adopting a blade coating method so as to form the barrier layer on the polyester base layer. And then preparing the heat-insulating high-transmittance polyester film through high-temperature mold pressing. Compared with the prior art, the polyester film prepared by the preparation method disclosed by the invention has the characteristics of high transparency and excellent heat insulation effect, and the problem of ultraviolet aging resistance is further improved, so that the polyester film with excellent ultraviolet resistance, tensile property and barrier property is obtained.

The application relates to the technical field of space electric propulsion, in particular to a hollow cathode and a processing method thereof, which comprises a composite substrate; the composite substrate is provided with a cathode salt; the preparation material of the composite substrate comprises tungsten carbide and lanthanum hexaboride; the application discloses a hollow cathode; the tungsten carbide and the lanthanum hexaboride are mixed and used, so that the hollow cathode disclosed by the application can not only ensure a low working temperature, but also ensure the current density emitted by the hollow cathode.